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Actually, you can file an amended return for 2009. The original return was due on April 15, 2010 and the 3 year statute gives you until April 15, 2013 to file the amended return. Also, if you do this you will be able to receive a full refund of any overpayment for that year.
The other years are closed but, under extreme circumstances the IRS can open them for you if it would be unjust to fail to do so. If your circumstances were sufficiently extreme and you can convince the IRS of this they may cooperate with you. To begin this process you should prepare the amended returns and take them along with ALL supporting documentation to the nearest IRS office and ask to speak with an agent. The supporting documentation should prove the deductions as well as the severity and duration of your illness. While success is not guaranteed it cannot hurt to try.